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C. E. SGRIBNER. DUPLEX ELECTRIC ARC LAMP.

N0. 491,603. Patented Feb. 14, 1893.

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CHARLES E. SGRIBNER, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE IVESTERN ELECTRIC COMPANY, OF SAME PLACE.

DUPLEX ELECTRIC-ARC LAMP.

SPECIFICATION forming part of Letters Patent No. 491,603, dated February 14, 1893.

Application filed October 27,1890. Serial No. 369,407. (No model.)

.To all whom it may concern: lifting mechanism of one lamp will held open Be it known that I, CHARLES E. SORIBNER, the circuit of the other lamp; third, in two acitizen of the United States, residing at Ohilamps having their carbons normally in concago, in the county of Cook and State of Illitact with a common shunt circuit including 5 nois, have invented a certain new and useful resistance around the lamps and means in Improvement in Duplex Arc Lamps, (Case No. each lamp while burning for holding open the 236,) of which the following is a full, clear, circuit of the other lamp; fourth, in two concise, and exact description,reference being lamps having each independent lifting and had to the accompanying drawing, forminga feeding mechanism and each provided with a [0 part of this specification. separate set of carbons normally in contact, My invention relates to electric are light of a shunt around both the lamps and a cut systems and its object, speaking generally, out in said shunt for each lamp operated by is to provide'for burning lamps in groups of the clutch mechanism thereof; and, fifth, in two upon the same circuit, the different memtwo lamps having their lifting magnets and 15 bers or pairs of a group being provided with carbons respectively in multiple arc, and circuits and mechanisms constructed to cause means controlled by the lifting magnets when one lamp to burn before the other. Each excited for reciprocally opening the circuit lamp may be provided with its own mechanofthe lifting magnet and carbons of the other ism for starting and maintaining the arc. The lamp, the lifting magnet first actuated thus 2o magnetic device included in the main circuit cutting outthe lifting magnet and carbons of for initially transferring power to separate the other lamp. the carbons may be termed, generally, the The lifting and feeding mechanism of each lifting mechanism, while the magnetic device lamp may be of the general construction deincluded in the shunt around the are for feedscribed and shown in my patent No. 415,571, z 5 ing the carbons responsively to changes in granted November 19,1889,for electric lamps, the electro motive force of the are may be in which the armature of the lifting magnet termed the feeding mechanism. In a broad is actuated to separate the carbons when the sense the entire mechanism by which the current is first established and thereafter carbons are moved may be termed the reguwhile the lamp is burning remains held down, 3o lating mechanism, though some have termed the feeding being effected by the fine wire the magnetic device in the shunt of the arc magnet in the shunt of the are. Any other the regulating mechanism, since it is by the form of mechanism may, however, be emmechanism in the shunt of the are that the ployed, provided the lifting mechanism be so feeding or regulation of the carbons is efarranged that when provided with a contact 3 5 fected after the arc has been once established, or circuit closing device the said circuit closihis feeding being accomplished preferably ing device will be held open, while the lamp independently of the lifting mechanism. In is burning. I either sense of the term each lamp is pro- My invention will be more readily undervided with its own regulating mechanism. stood by'reference to the accompanying draw- 0 0 My invention consists, first, in two lamps ing, in which I have shown two are lamps connected in multiple arc in the same circuit connected in multiple are with circuits and and provided with a shunt containing resistconnections embodying my invention. ance around both of the lamps, each lamp The circuit is normally closed around having its own contact or cut out included in both lamps through the common shunt wire 5 45 said shunt; second,-in two lamps connected a which may contain a slight resistance 1). in multiple arc and provided each with a cir- In this shunt Wire at each lamp I provide a cuit closing device controlled by the lifting cut out. Thus at lamp 1 I provide the cut mechanism thereof, these contact points beout 0 and at lamp 2 the cut out 0; these cut ing placed reciprocally each in that part of outs cand a being preferably operated by the I00 0 the multiple circuit leading to the carbons of clutch levers so that when either clutch lever the other lamp so that the movement of the is slightly moved its out out will be opened.

The circuit through lamp 1 may be traced from the positive wire through contact or circuit closer (Z controlled by the lifting mechanism of lamp 2 and thence through lifting magnet 6 and carbonsfand thence outby the negative wire. The circuit through lamp 2 in a similar manner may be traced to the contact or circuit closer (1 controlled bythelifting mechanism oflamp 1 and thence through lifting magnet e'andcarbonsfof lamp2 and thenceoutby wire. The carbon regulating or feeding mechanism g of lamp 1 is placed in the usual manner in a shunt circuit around the carbons f. The carbon feeding mechanism 9 of lamp 2 is placed in a shunt around the carbons f of lamp 2. Thus the lifting magnet e and carbons f of lamp 1 and the lifting magnet c and carbons f of lamp 2 are placed in multiple arc. Moreover, these circuits are so arranged with respect to circuit closers d (Z that whichever circuit closer (1 dis first opened will act to prevent the circuit closer of the other lamp from being opened. Thus if lifting mechanism ,e of lamp 2 acts first to open contact (Z the current will be out off from the lifting mechanism 6 of lamp 1 so that circuit closer (1 will remain closed and current will be thus maintained through lamp 2. On the other hand if when current is established cut out (1' should be first opened lifting magnet.

6 will be cut out and prevent cut out (1 from being opened so that current will be maintained through lamp 1.

In is preferable to adjust the two lamps uniformly, that is, to have the lifting magnets and their parts symmetrical in all respects since the accidental difierence which will necessarily be found between the sets of carbons fand f will be sufficient to cause one or the other of the lifting mechanisms to act in advance of the other, and it is wholly immaterial which lamp shall burn first. It is, however, desirable that both lamps should act alike in order that a uniform arc may be maintained during the entire service of the two lamps. cuit closer (Z happens to open first. The current will then be directed through lamp 1 and lamp 1 will burn until its carbon rod shall be arrested by its stop It or in some other well known way. The electro motive force of the arc of carbons f will thus be abnormally increased and cut out 0 will be closed, thus extinguishing the arc, and since carbons f are now held from feeding, the circuit through lamp 1 will be held open between the carbons f. The lifting magnet a will thus be de-energized and its armature will be drawn back to the position shown to close the contact d; the current will now be sent through lifting magnet e and carbons f of lamp 2; lamp 2 will thus be brought into service immediately after lamp 1 is extinguished so that I shall have the light continued until carbons f of lamp 2 shall be consumed when the cut out o acting in the usual way will close the shunt a around both the lamps.

Assume, for example, that cir-.

Two lamps provided with circuits as above described may thus be made to take the place of a double carbon lamp.

Having thus described my invention I claim as new and desire to secure by Letters Patent:

1. In an arc light system two lamps each provided with lifting and feeding mechanism and connected in multiple arc, of contacts one for each lamp controlled by the lifting mechanism thereof, said contacts being placed reciprocally each in that part of the multiple circuit leading to the carbons of the other lamp, whereby when either lifting mechanism is actuated to separate the carbons of its lamp the contact controlled by said actuated lifting mechanism will be opened and held open.

2. The combination with two lamps adapted to burn one after the other and connected in the same circuit in multiple arc, of a shunt circuit containing resistance around both lamps passing through two contacts or cut outs, one controlled by the lever of each lamp whereby when the clutch lever of the lamp which is burning is lowered to close the contact or cut out controlled thereby both lamps will be shunted.

3. The combination with two lamps connected in multiple are, of two contacts placed reciprocally in the multiple circuit including the other lamp, the carbons of each of said lamps being normally in contact, and ashunt around both lamps, including two'cut outs one for each lamp, the feeding mechanism in each lamp in a shunt around the carbons thereof, and the lifting mechanism actuated a definite distance to separate the carbons of its lamp and establish the arc and hold open the contact in the multiple circuit including the other lamp.

at. Two lamps placed in multiple arc and provided with a shunt of low resistance around both, a cut out adapted to be closed on an abnormal increase of the electro motive force of the are of its lamp being provided in said shunt at each lamp, the lifting magnet and carbons of the different lamps being reciprocally placed in circuit immediately after a contact which is opened by the force of the lifting magnet of the other lamp when first excited, whereby one lamp is caused to burn after the other, the lamp burning first whose lifting magnet is first sufficiently excited to open the contact controlled thereby.

5. In an electric arc lamp system two lamps each havingalifting andafeeding mechanism, the lifting and feeding mechanisms having independent control ofthe carbon rod movements, a circuit closer for each lifting mechanism controlled thereby, a main circuit and derived circuits therefrom, each derived circuit including one of the lamps and the circuit closer of the other lamp, whereby when either of the lamps is burning the circuit of the other lamp is held open at the circuit closer.

6. In an electric arc lamp system the combination with two lamps in derived circuit, the lifting mechanism of one lamp controlling a circuit closer in circuit with the other lamp, a shunt circuit including resistance about both lamps, said shunt circuit including in its circuita circuit closer or circuit closers controlled by each lamp, whereby the circuit may be reciprocally shifted from one lamp to the other.

7. The combination in an electric arc lamp system, of a lifting mechanism and a feeding mechanism in each of two lamps, the two lamps being placed in multiple arc, the controlling electro magnet of the feeding mechanisms being in the shunt of the arc of its CHARLES E. SORIBNER.

Witnesses:

ELLA EDLER, GEORGE P. BARTON, 

